A projection lens (46) is located at an end of an optical unit (4) of approximately planarly-viewed L-shape, the projection lens enlarging and projecting a color image combined by a cross dichroic prism of an optical device body and including a linearly-advancing barrel (46B) fixed to a head (49) formed on an optical component casing, a cam barrel (46C) provided with a lever (46A), zoom-magnification converting lenses, focus-adjusting lenses and fixed lens, the linearly-advancing barrel (46B) and the cam barrel (46C) being made of polycarbonate, where a control board is disposed above a projection lens (46) to planarly cover the projection lens (46).
Legal claims defining the scope of protection, as filed with the USPTO.
1. A projector, comprising: an electric optical device that modulates a light beam irradiated by a light source in accordance with image information; a projection lens that enlarges and projects the light beam modulated by the electric optical device; and a control board that controls the electric optical device in accordance with the image information, wherein the projection lens has a plurality of beam-condensing elements and a lens-barrel that houses the plurality of beam-condensing elements, wherein the control board is disposed adjacent to the projection lens, and wherein the lens-barrel is made of non-metal member.
2. The projector according to claim 1 , wherein the control board is located along a plane defined by an optical path from the light source to the projection lens, the control board planarly covering the lens barrel.
3. The projector according to claim 1 , wherein the distance between a circuit element installed on the control board and the lens barrel is within forty millimeters.
4. The projector according to claim 1 , further comprising an optical component casing that houses optical components disposed on an optical path from the light source to the electric optical device, wherein a base end of the lens barrel is fixed to a head formed on the optical component casing, the head being formed of a non-metal member.
5. The projector according to claim 1 , wherein a cooling fan is located adjacent to the lens barrel.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 21, 2003
September 21, 2004
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